How big can Goliath beetles grow?

A range of 40-50 grams/1.4-1.75 ounces is how big Goliath beetles [Goliathus spp] can grow as adults. They also may mature to a length of 50-80 milliliters/2.0-3.1 inches for females, and 60-110 milliliters/2.4-4.3 inches for males.

They're even bigger in their larval stage. As larvae, they may weigh in at 80-100 grams/2.8-3.5 ounces.